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Key Documents

208574

Sigma-Aldrich

Molecular sieves, 3 Å

beads, 4-8 mesh

Synonyme(s) :

Molekularsieb UOP Typ 3A

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About This Item

Formule linéaire :
KnNa12-n[(AlO2)12(SiO2)12] · xH2O
Numéro CAS:
308080-99-1
Numéro MDL:
MFCD00147627
Code UNSPSC :
23201100
eCl@ss :
32110204
Nomenclature NACRES :
NB.24

Forme

beads

Niveau de qualité

100

Taille des particules

4-8 mesh

Dimension de pores

3 Å

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Description générale

Molecular sieves are crystalline metal aluminosilicates having a 3-dimensional interconnecting network of silica and alumina tetrahedra. Natural water of hydration is removed from this network by heating to produce uniform cavities which selectively adsorb molecules of a specific size. The 3A form is made by substituting potassium cations for the inherent sodium ions of the 4A structure, reducing the effective pore size to ~3Å, excluding diameter >3Å, e.g., ethane. The 4 to 8-mesh type is normally used in gas-phase applications. Molecular sieves are considered a universal drying agent in polar and nonpolar media.

Application

Molecular sieves have been used for the drying of dimethyl sulfoxide.
They may also be used in the following:
  • Synthesis of ecteinascidin 743 (a potential marine-derived antitumor agent).
  • Preparation of vanillyl nonanoate (a model capsinoid compound).
  • Highly enantioselective Friedel-Crafts alkylation of indoles with nitroalkenes.
Molecular sieves, 3 Å may be used in the following processes:
  • As a general-purpose drying agent in polar and nonpolar media.
  • Commercial dehydration of unsaturated hydrocarbon streams, including cracked gas, propylene, butadiene, acetylene
  • Drying polar liquids such as methanol and ethanol.
  • Adsorption of molecules such as NH3 and H2O from a N2/H2 flow.

Code de la classe de stockage

13 - Non Combustible Solids

Classe de danger pour l'eau (WGK)

WGK 3

Point d'éclair (°F)

Not applicable

Point d'éclair (°C)

Not applicable

Certificats d'analyse (COA)

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Infrared spectroscopy studies on stability of dimethyl sulfoxide for application in a Li?air battery
Mozhzhukhina N, et al.
The Journal of Physical Chemistry C, 117(36), 18375-18380 (2013)
Chiral phosphoric acid catalyzed enantioselective Friedel-Crafts alkylation of indoles with nitroalkenes: cooperative effect of 3 A molecular sieves.
Junji Itoh et al.
Angewandte Chemie (International ed. in English), 47(21), 4016-4018 (2008-04-18)
Enantioselective total synthesis of ecteinascidin 743.
Corey EJ, et al.
Journal of the American Chemical Society, 118(38), 9202-9203 (1996)
Kenji Kobata et al.
Bioscience, biotechnology, and biochemistry, 66(2), 319-327 (2002-05-10)
Capsinoids are a novel group of compounds produced by the Capsicum plant. We synthesized a capsinoid by the lipase-catalyzed esterification of vanillyl alcohol with fatty acid derivatives in an organic solvent. The use of seven out of 17 commercially available

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